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RFC 5905, "Network Time Protocol Version 4: Protocol and Algorithms Specification", June 2010

Source of RFC: ntp (int)

Errata ID: 4504

Status: Reported
Type: Technical

Reported By: Miroslav Lichvar
Date Reported: 2015-10-15

Section 7.2 says:

   LI Leap Indicator (leap): 2-bit integer warning of an impending leap
   second to be inserted or deleted in the last minute of the current
   month with values defined in Figure 9.

           +-------+----------------------------------------+
           | Value | Meaning                                |
           +-------+----------------------------------------+
           | 0     | no warning                             |
           | 1     | last minute of the day has 61 seconds  |
           | 2     | last minute of the day has 59 seconds  |

It should say:

   LI Leap Indicator (leap): 2-bit integer warning of an impending leap
   second to be inserted or deleted in the last minute of the current
   day with values defined in Figure 9.

           +-------+----------------------------------------+
           | Value | Meaning                                |
           +-------+----------------------------------------+
           | 0     | no warning                             |
           | 1     | last minute of the day has 61 seconds  |
           | 2     | last minute of the day has 59 seconds  |

Notes:

There is an inconsistency (day vs month) between the LI description and the description of values in the Figure 9. Few paragraphs before that text there is: Except for a minor variation when using the IPv6 address family, these fields are backwards compatible with NTPv3.

If it was month instead of day it would not be compatible with RFC 1305 (NTPv3) and RFC 4330 (SNTPv4), which were obsoleted by RFC 5905.

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